Road blocks, police helicopters, blacked-out windows: What do they do at Bilderberg?

Delegates for a private conference of top politicians and businesspeople from around the world have started to arrive at a luxury country hotel.

Several cars with blacked-out windows entered the gates of the Grove Hotel, near Watford, in Hertfordshire, this morning for the secretive meeting of the Bilderberg Group.

It is thought billionaire executives from multinational companies such as Amazon and Google, high-ranking political figures including Chancellor George Osborne, and even members of royal families are among the 130 or so attendees.

Famous for being shrouded in secrecy, the Bilderberg conference is taking place in Britain for the first time since 1998 and conspiracy theorists believe this is where leaders plot world domination.